vaughan



A. O. VAUGHAN, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 76,278, dated MCMLIL 31, 1868.

IMPROVEMENT IN AUGERS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, A. O. VAUGHAN, of Philadelphia, Pennsylvania, haveinvented an Improved Auger; and I do hereby declare the following to bea. full, clear, and exact description of the same.

My invention consists of a tubewith a screw-thread on the outside, andcutting-edges at the lower end,

'arrangedin respect to the screw-thread, as fully described hereafter,so that the said thread will guide thetool as it penetrates a block orstrip of wood, and so that, Whatever may be the extent to which the toolis worn,

cutting-edges properly arranged may be produced, by cutting away thescrew-thread, and the tube adjacent to the same. I

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describeits construction and operation,reference being had to the accompanying drawing, which forms a part ofthis specification, and in which Figure is an exterior view of myimproved auger;

Figure 2, a sectional view on the'line 1-2, fig. 1.

Figure 3, an inverted plan view of fig. 1; and

Figure 4, a detached sectional view, drawn to an enlarged scale.

A is a metal tube, near the upper end of which is a flange, a, the saidtube being enlarged in diameter internally, from a point, '0, upward,for a purpose described hereafter.

At the lower end of the tube is a recess, y, and on the outside'is ascrew-thread, b, which meets the lower edge of the tube at one side ofthe recess y, where a lip, e, is formed. The thread 6 is cut away at itslower end, so as to form two cutting-edges, z' z", the former beingvertieal,'and the latter slightly inclined from the point where it meetsthe edge 2', to the lip e, (fig. 1,) the curved portion of which is alsoformed into a short cutting-edge, bevelled from the inside. The auger issecured to a brace, and is operated in the same manner as an auger ofthe ordinary construction, a portion of the wood being received withinthe tube, while the particles or chips detached by the action of thecutting-edges are withdrawn by the screw thread b.

Although this tool may lie-employed as a substitute for the ordinaryauger, it is especially adapted for removingspikes from planksand beams,into which they have been driven. To effect this object, the end of thetool is placed against thewood, directly over the spike, which, astheopening is bored, is received into the hollow stem. When the auger haspenetrated a distance equal to the length of the spike, it is withdrawn,the spike, and a portion of the woodsurrounding it, remaining within theauger, from which they may be readily removed, inasmuch as the body ofwood surrounding the spike has been so reduced in passing through thecon traeted end of the tube below the shoulder c, that it fits butloosely in the enlarged part of the tube aboue the shoulder.

It will be seen that, as the outer edge of 'thescrew-thread b is on aline with or nearly on a. line with the cutting-edge 'i, the saidthread, as an opening is bored,-will bear against the sides ofthe saidopening, and will thus guide the tool, 'so that it cannot change itsdirection after it has entered the wood, and that whatever may be theextent to which the tool is worn, cutting-edges properly arranged, mayalways be produced, by cutting awaya .portionof the'thread, and of thetube adjacent to the same. I

I do not claim, broadly, a tubular auger, with an external screwthread,nor the arrangement, in such an anger, of an inner cutting-edge, outercutting-edge, and a recess, 3 but I claim as my invention, and desire tosecure by Letters Patent The metal tube A, with its externalscrew-thread, 6, extending to the lower end of the tube, when thelatter, with the screw-thread, is cutaway, to form the cutting-edges a2' i and when the outer edge of the screw-thread is on a line with ornearly on a line with'the outer cutting-edge 2', for the purposedescribed.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

A. C. VAUGHAN.

Witnesses:

Enw. H. WILLIAMsoN, WM. ALBERT STEEL.

